The Superhero Database Classification number, or SHDB Class, is a number that represents the overall 'power' of a character. All traits of a character are used for calculating the Classification.
What it DOESN'T mean
This doesn't mean that a higher class would always beat a lower class character. But the bigger the difference in Class is, the more obvious it is who'll win in a fight.
How is this calculated
( INT^1.3 + (STR*0.5 )^2 + (SPE*0.5)^2 + DUR^1.6 + (POW + (SPS*SPL))^2 + COM^1.8 ) ^ TIER
Super Power Score and Level
Every Super Power has a score (SPS) that is used to calculate the Class. Each Super Power also has 3 levels (SPL). The level is set when connecting that Super Power to a character. The level determines the final score, of the Super Power, being used in the calculation.
"What I want is irrelevant. This Shout was used once before, was it not? And here we are again. Have you considered that Alduin was not meant to be defeated? Those who overthrew him in ancient times only postponed the day of reckoning, they did not stop it. If the world is meant to end, so be it. Let it end and be reborn."
This implies that Alduins true self is indestructible since he's a mandatory counterpart to the functioning of the kalpas. A piece of the most powerful deity, Akatosh.